function banner() {
};

banner = new banner();
number = 0;

banner[number++] = "<a href='http://www.horrormerch.com/free-catalog.html'><img src='ads/catalog728.jpg' border=0></a>"
banner[number++] = "<a href='http://www.horrormerch.com/news.shtml#freestuff'><img src='ads/freemerch728.jpg' border=0></a>"
banner[number++] = "<a href='http://www.horrormerch.com/news.shtml#streetteam'><img src='http://www.horrormerch.com/ads/street728.jpg' border=0></a>"
banner[number++] = "<a href='http://www.horrormerch.com/news.shtml#16volt'><img src='http://16volt.com/midighetto/midi_ghetto_728x90.gif' border=0></a>"
increment = Math.floor(Math.random() * number);

document.write(banner[increment]);